I managed to fix the filter but I still feel there must be an easier way to 
do it.

<$vars prefix="[[" suffix="]]">
<$button>
<$action-sendmessage
    $message="tm-new-tiddler"
    source={{{ 
[all[current]regexp[\s]addprefix<prefix>addsuffix<suffix>else{!!title}] }}}
    author={{!!author}}/>
Add
</$button>
</$vars>

On Tuesday, 22 June 2021 at 23:10:04 UTC+2 Sebastián Ortega wrote:

> Hello wise tiddlywiki users,
>
> Let's say I want to convert the current tiddler title into list format. 
> For example:
>
>    - For a tiddler named CamelCased, this is either CamelCased or 
>    [[CamelCased]] (I prefer the format but I can settle with the latter)
>    - For a tiddler named Name with spaces it must be [[Name with spaces]]
>
> I'm stuck with trying to add squared brackets conditionally 
> [all[current]regexp[\s]addprefix[[[]addsuffix[]]]else{!!title}] because 
> that's not the right syntax for adding the brackets and also because this 
> feels common enough that it should be some easier way to "escape" a string 
> to a title list format.
>
> Do you know how to get it?
>
>

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